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| <html><head> | |
| <meta charset="utf-8"> | |
| <title>npm-exec</title> | |
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| npm command-line interface | |
| </div> | |
| </div> | |
| </div> | |
| <section id="content"> | |
| <header class="title"> | |
| <h1 id="npm-exec">npm-exec</h1> | |
| <span class="description">Run a command from a local or remote npm package</span> | |
| </header> | |
| <section id="table_of_contents"> | |
| <h2 id="table-of-contents">Table of contents</h2> | |
| <div id="_table_of_contents"><ul><li><a href="#synopsis">Synopsis</a></li><li><a href="#description">Description</a></li><li><a href="#npx-vs-npm-exec"><code>npx</code> vs <code>npm exec</code></a></li><li><a href="#configuration">Configuration</a></li><ul><li><a href="#package"><code>package</code></a></li><li><a href="#call"><code>call</code></a></li><li><a href="#workspace"><code>workspace</code></a></li><li><a href="#workspaces"><code>workspaces</code></a></li><li><a href="#include-workspace-root"><code>include-workspace-root</code></a></li></ul><li><a href="#examples">Examples</a></li><li><a href="#workspaces-support">Workspaces support</a></li><ul><li><a href="#filtering-workspaces">Filtering workspaces</a></li></ul><li><a href="#compatibility-with-older-npx-versions">Compatibility with Older npx Versions</a></li><li><a href="#a-note-on-caching">A note on caching</a></li><ul><li><a href="#prefer-online">prefer-online</a></li><li><a href="#prefer-offline">prefer-offline</a></li><li><a href="#offline">offline</a></li><li><a href="#workspace2">workspace</a></li><li><a href="#workspaces2">workspaces</a></li></ul><li><a href="#see-also">See Also</a></li></ul></div> | |
| </section> | |
| <div id="_content"><h3 id="synopsis">Synopsis</h3> | |
| <pre><code class="language-bash">npm exec -- <pkg>[@<version>] [args...] | |
| npm exec --package=<pkg>[@<version>] -- <cmd> [args...] | |
| npm exec -c '<cmd> [args...]' | |
| npm exec --package=foo -c '<cmd> [args...]' | |
| alias: x | |
| </code></pre> | |
| <h3 id="description">Description</h3> | |
| <p>This command allows you to run an arbitrary command from an npm package | |
| (either one installed locally, or fetched remotely), in a similar context | |
| as running it via <code>npm run</code>.</p> | |
| <p>Run without positional arguments or <code>--call</code>, this allows you to | |
| interactively run commands in the same sort of shell environment that | |
| <code>package.json</code> scripts are run. Interactive mode is not supported in CI | |
| environments when standard input is a TTY, to prevent hangs.</p> | |
| <p>Whatever packages are specified by the <code>--package</code> option will be | |
| provided in the <code>PATH</code> of the executed command, along with any locally | |
| installed package executables. The <code>--package</code> option may be | |
| specified multiple times, to execute the supplied command in an environment | |
| where all specified packages are available.</p> | |
| <p>If any requested packages are not present in the local project | |
| dependencies, then a prompt is printed, which can be suppressed by | |
| providing either <code>--yes</code> or <code>--no</code>. When standard input is not a TTY or a | |
| CI environment is detected, <code>--yes</code> is assumed. The requested packages are | |
| installed to a folder in the npm cache, which is added to the <code>PATH</code> | |
| environment variable in the executed process.</p> | |
| <p>Package names provided without a specifier will be matched with whatever | |
| version exists in the local project. Package names with a specifier will | |
| only be considered a match if they have the exact same name and version as | |
| the local dependency.</p> | |
| <p>If no <code>-c</code> or <code>--call</code> option is provided, then the positional arguments | |
| are used to generate the command string. If no <code>--package</code> options | |
| are provided, then npm will attempt to determine the executable name from | |
| the package specifier provided as the first positional argument according | |
| to the following heuristic:</p> | |
| <ul> | |
| <li>If the package has a single entry in its <code>bin</code> field in <code>package.json</code>, | |
| or if all entries are aliases of the same command, then that command | |
| will be used.</li> | |
| <li>If the package has multiple <code>bin</code> entries, and one of them matches the | |
| unscoped portion of the <code>name</code> field, then that command will be used.</li> | |
| <li>If this does not result in exactly one option (either because there are | |
| no bin entries, or none of them match the <code>name</code> of the package), then | |
| <code>npm exec</code> exits with an error.</li> | |
| </ul> | |
| <p>To run a binary <em>other than</em> the named binary, specify one or more | |
| <code>--package</code> options, which will prevent npm from inferring the package from | |
| the first command argument.</p> | |
| <h3 id="npx-vs-npm-exec"><code>npx</code> vs <code>npm exec</code></h3> | |
| <p>When run via the <code>npx</code> binary, all flags and options <em>must</em> be set prior to | |
| any positional arguments. When run via <code>npm exec</code>, a double-hyphen <code>--</code> | |
| flag can be used to suppress npm's parsing of switches and options that | |
| should be sent to the executed command.</p> | |
| <p>For example:</p> | |
| <pre><code>$ npx foo@latest bar --package=@npmcli/foo | |
| </code></pre> | |
| <p>In this case, npm will resolve the <code>foo</code> package name, and run the | |
| following command:</p> | |
| <pre><code>$ foo bar --package=@npmcli/foo | |
| </code></pre> | |
| <p>Since the <code>--package</code> option comes <em>after</em> the positional arguments, it is | |
| treated as an argument to the executed command.</p> | |
| <p>In contrast, due to npm's argument parsing logic, running this command is | |
| different:</p> | |
| <pre><code>$ npm exec foo@latest bar --package=@npmcli/foo | |
| </code></pre> | |
| <p>In this case, npm will parse the <code>--package</code> option first, resolving the | |
| <code>@npmcli/foo</code> package. Then, it will execute the following command in that | |
| context:</p> | |
| <pre><code>$ foo@latest bar | |
| </code></pre> | |
| <p>The double-hyphen character is recommended to explicitly tell npm to stop | |
| parsing command line options and switches. The following command would | |
| thus be equivalent to the <code>npx</code> command above:</p> | |
| <pre><code>$ npm exec -- foo@latest bar --package=@npmcli/foo | |
| </code></pre> | |
| <h3 id="configuration">Configuration</h3> | |
| <h4 id="package"><code>package</code></h4> | |
| <ul> | |
| <li>Default:</li> | |
| <li>Type: String (can be set multiple times)</li> | |
| </ul> | |
| <p>The package or packages to install for <a href="../commands/npm-exec.html"><code>npm exec</code></a></p> | |
| <h4 id="call"><code>call</code></h4> | |
| <ul> | |
| <li>Default: ""</li> | |
| <li>Type: String</li> | |
| </ul> | |
| <p>Optional companion option for <code>npm exec</code>, <code>npx</code> that allows for specifying a | |
| custom command to be run along with the installed packages.</p> | |
| <pre><code class="language-bash">npm exec --package yo --package generator-node --call "yo node" | |
| </code></pre> | |
| <h4 id="workspace"><code>workspace</code></h4> | |
| <ul> | |
| <li>Default:</li> | |
| <li>Type: String (can be set multiple times)</li> | |
| </ul> | |
| <p>Enable running a command in the context of the configured workspaces of the | |
| current project while filtering by running only the workspaces defined by | |
| this configuration option.</p> | |
| <p>Valid values for the <code>workspace</code> config are either:</p> | |
| <ul> | |
| <li>Workspace names</li> | |
| <li>Path to a workspace directory</li> | |
| <li>Path to a parent workspace directory (will result in selecting all | |
| workspaces within that folder)</li> | |
| </ul> | |
| <p>When set for the <code>npm init</code> command, this may be set to the folder of a | |
| workspace which does not yet exist, to create the folder and set it up as a | |
| brand new workspace within the project.</p> | |
| <p>This value is not exported to the environment for child processes.</p> | |
| <h4 id="workspaces"><code>workspaces</code></h4> | |
| <ul> | |
| <li>Default: null</li> | |
| <li>Type: null or Boolean</li> | |
| </ul> | |
| <p>Set to true to run the command in the context of <strong>all</strong> configured | |
| workspaces.</p> | |
| <p>Explicitly setting this to false will cause commands like <code>install</code> to | |
| ignore workspaces altogether. When not set explicitly:</p> | |
| <ul> | |
| <li>Commands that operate on the <code>node_modules</code> tree (install, update, etc.) | |
| will link workspaces into the <code>node_modules</code> folder. - Commands that do | |
| other things (test, exec, publish, etc.) will operate on the root project, | |
| <em>unless</em> one or more workspaces are specified in the <code>workspace</code> config.</li> | |
| </ul> | |
| <p>This value is not exported to the environment for child processes.</p> | |
| <h4 id="include-workspace-root"><code>include-workspace-root</code></h4> | |
| <ul> | |
| <li>Default: false</li> | |
| <li>Type: Boolean</li> | |
| </ul> | |
| <p>Include the workspace root when workspaces are enabled for a command.</p> | |
| <p>When false, specifying individual workspaces via the <code>workspace</code> config, or | |
| all workspaces via the <code>workspaces</code> flag, will cause npm to operate only on | |
| the specified workspaces, and not on the root project.</p> | |
| <p>This value is not exported to the environment for child processes.</p> | |
| <h3 id="examples">Examples</h3> | |
| <p>Run the version of <code>tap</code> in the local dependencies, with the provided | |
| arguments:</p> | |
| <pre><code>$ npm exec -- tap --bail test/foo.js | |
| $ npx tap --bail test/foo.js | |
| </code></pre> | |
| <p>Run a command <em>other than</em> the command whose name matches the package name | |
| by specifying a <code>--package</code> option:</p> | |
| <pre><code>$ npm exec --package=foo -- bar --bar-argument | |
| # ~ or ~ | |
| $ npx --package=foo bar --bar-argument | |
| </code></pre> | |
| <p>Run an arbitrary shell script, in the context of the current project:</p> | |
| <pre><code>$ npm x -c 'eslint && say "hooray, lint passed"' | |
| $ npx -c 'eslint && say "hooray, lint passed"' | |
| </code></pre> | |
| <h3 id="workspaces-support">Workspaces support</h3> | |
| <p>You may use the <a href="../using-npm/config#workspace.html"><code>workspace</code></a> or | |
| <a href="../using-npm/config#workspaces.html"><code>workspaces</code></a> configs in order to run an | |
| arbitrary command from an npm package (either one installed locally, or fetched | |
| remotely) in the context of the specified workspaces. | |
| If no positional argument or <code>--call</code> option is provided, it will open an | |
| interactive subshell in the context of each of these configured workspaces one | |
| at a time.</p> | |
| <p>Given a project with configured workspaces, e.g:</p> | |
| <pre><code>. | |
| +-- package.json | |
| `-- packages | |
| +-- a | |
| | `-- package.json | |
| +-- b | |
| | `-- package.json | |
| `-- c | |
| `-- package.json | |
| </code></pre> | |
| <p>Assuming the workspace configuration is properly set up at the root level | |
| <code>package.json</code> file. e.g:</p> | |
| <pre><code>{ | |
| "workspaces": [ "./packages/*" ] | |
| } | |
| </code></pre> | |
| <p>You can execute an arbitrary command from a package in the context of each of | |
| the configured workspaces when using the | |
| <a href="../using-npm/config#workspace.html"><code>workspaces</code> config options</a>, in this example | |
| we're using <strong>eslint</strong> to lint any js file found within each workspace folder:</p> | |
| <pre><code>npm exec --ws -- eslint ./*.js | |
| </code></pre> | |
| <h4 id="filtering-workspaces">Filtering workspaces</h4> | |
| <p>It's also possible to execute a command in a single workspace using the | |
| <code>workspace</code> config along with a name or directory path:</p> | |
| <pre><code>npm exec --workspace=a -- eslint ./*.js | |
| </code></pre> | |
| <p>The <code>workspace</code> config can also be specified multiple times in order to run a | |
| specific script in the context of multiple workspaces. When defining values for | |
| the <code>workspace</code> config in the command line, it also possible to use <code>-w</code> as a | |
| shorthand, e.g:</p> | |
| <pre><code>npm exec -w a -w b -- eslint ./*.js | |
| </code></pre> | |
| <p>This last command will run the <code>eslint</code> command in both <code>./packages/a</code> and | |
| <code>./packages/b</code> folders.</p> | |
| <h3 id="compatibility-with-older-npx-versions">Compatibility with Older npx Versions</h3> | |
| <p>The <code>npx</code> binary was rewritten in npm v7.0.0, and the standalone <code>npx</code> | |
| package deprecated at that time. <code>npx</code> uses the <code>npm exec</code> | |
| command instead of a separate argument parser and install process, with | |
| some affordances to maintain backwards compatibility with the arguments it | |
| accepted in previous versions.</p> | |
| <p>This resulted in some shifts in its functionality:</p> | |
| <ul> | |
| <li>Any <code>npm</code> config value may be provided.</li> | |
| <li>To prevent security and user-experience problems from mistyping package | |
| names, <code>npx</code> prompts before installing anything. Suppress this | |
| prompt with the <code>-y</code> or <code>--yes</code> option.</li> | |
| <li>The <code>--no-install</code> option is deprecated, and will be converted to <code>--no</code>.</li> | |
| <li>Shell fallback functionality is removed, as it is not advisable.</li> | |
| <li>The <code>-p</code> argument is a shorthand for <code>--parseable</code> in npm, but shorthand | |
| for <code>--package</code> in npx. This is maintained, but only for the <code>npx</code> | |
| executable.</li> | |
| <li>The <code>--ignore-existing</code> option is removed. Locally installed bins are | |
| always present in the executed process <code>PATH</code>.</li> | |
| <li>The <code>--npm</code> option is removed. <code>npx</code> will always use the <code>npm</code> it ships | |
| with.</li> | |
| <li>The <code>--node-arg</code> and <code>-n</code> options are removed.</li> | |
| <li>The <code>--always-spawn</code> option is redundant, and thus removed.</li> | |
| <li>The <code>--shell</code> option is replaced with <code>--script-shell</code>, but maintained | |
| in the <code>npx</code> executable for backwards compatibility.</li> | |
| </ul> | |
| <h3 id="a-note-on-caching">A note on caching</h3> | |
| <p>The npm cli utilizes its internal package cache when using the package | |
| name specified. You can use the following to change how and when the | |
| cli uses this cache. See <a href="../commands/npm-cache.html"><code>npm cache</code></a> for more on | |
| how the cache works.</p> | |
| <h4 id="prefer-online">prefer-online</h4> | |
| <p>Forces staleness checks for packages, making the cli look for updates | |
| immediately even if the package is already in the cache.</p> | |
| <h4 id="prefer-offline">prefer-offline</h4> | |
| <p>Bypasses staleness checks for packages. Missing data will still be | |
| requested from the server. To force full offline mode, use <code>offline</code>.</p> | |
| <h4 id="offline">offline</h4> | |
| <p>Forces full offline mode. Any packages not locally cached will result in | |
| an error.</p> | |
| <h4 id="workspace2">workspace</h4> | |
| <ul> | |
| <li>Default:</li> | |
| <li>Type: String (can be set multiple times)</li> | |
| </ul> | |
| <p>Enable running a command in the context of the configured workspaces of the | |
| current project while filtering by running only the workspaces defined by | |
| this configuration option.</p> | |
| <p>Valid values for the <code>workspace</code> config are either:</p> | |
| <ul> | |
| <li>Workspace names</li> | |
| <li>Path to a workspace directory</li> | |
| <li>Path to a parent workspace directory (will result to selecting all of the | |
| nested workspaces)</li> | |
| </ul> | |
| <p>This value is not exported to the environment for child processes.</p> | |
| <h4 id="workspaces2">workspaces</h4> | |
| <ul> | |
| <li>Alias: <code>--ws</code></li> | |
| <li>Type: Boolean</li> | |
| <li>Default: <code>false</code></li> | |
| </ul> | |
| <p>Run scripts in the context of all configured workspaces for the current | |
| project.</p> | |
| <h3 id="see-also">See Also</h3> | |
| <ul> | |
| <li><a href="../commands/npm-run-script.html">npm run-script</a></li> | |
| <li><a href="../using-npm/scripts.html">npm scripts</a></li> | |
| <li><a href="../commands/npm-test.html">npm test</a></li> | |
| <li><a href="../commands/npm-start.html">npm start</a></li> | |
| <li><a href="../commands/npm-restart.html">npm restart</a></li> | |
| <li><a href="../commands/npm-stop.html">npm stop</a></li> | |
| <li><a href="../commands/npm-config.html">npm config</a></li> | |
| <li><a href="../using-npm/workspaces.html">npm workspaces</a></li> | |
| <li><a href="../commands/npx.html">npx</a></li> | |
| </ul></div> | |
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